Oil and natural gas properties (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Extractive Industries [Abstract]
Proved property	$ 8,903,060	$ 7,694,412
Unproved property	1,365,951	321,124
Work in process	0vyey_DrillingInProcessCosts	25,897vyey_DrillingInProcessCosts
Total oil and natural gas properties, at cost	10,269,011	8,041,433
Less: accumulated impairment	(7,430,438)	(4,325,785)
Oil and natural gas properties, net of impairment	2,838,573	3,715,648
Less: accumulated depletion	(1,942,380)	(1,517,836)
Oil and natural gas properties, net	$ 896,193	$ 2,197,812

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Amount of accumulated depreciation, depletion and amortization of oil and gas property carried under the successful effort method. Oil and gas property include, but not limited to, the entity's wells and related equipment and facilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61901-109447

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-10.(b))

-URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862

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- Definition

Accumulated impairment of oil and gas property carried under the successful effort method.

+ References

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- Definition

Oil and gas properties net of accumulated depreciation, depletion, amortization, impairment, and abandonment, carried under the successful effort method.

+ References

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- Definition

Oil and Gas properties with proved reserves under the successful effort method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 360

-Glossary Proved Properties

-URI http://asc.fasb.org/extlink&oid=6522428

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 360

-Section 25

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6474861&loc=d3e64746-109465

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- Definition

Oil and Gas properties with unproved reserves under the successful effort method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 14

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61926-109447

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-Glossary Unproved Properties

-URI http://asc.fasb.org/extlink&oid=6527831

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-Publisher FASB

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-Topic 932

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- Definition

Drilling In Process Costs

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Oil and Gas Property Successful Effort Method Cost

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- Definition

Oil and Natural Gas properties net impairment.

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